在Java代碼中使用ZipFile解壓zip文件

利用java.util.zip.ZipFile類，來解壓文件。

可以解壓zip,jar,war,但無法解壓rar文件。

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class UnZip {
	static final int BUFFER = 1024;

	public void unzip(File unZipDir, File zip) throws IOException {
		if (!zip.exists()) {
			return;
		}
		if (!unZipDir.exists()) {
			unZipDir.mkdirs();
		}
		if (!unZipDir.isDirectory()) {
			return;
		}
	    int fileCount = 0;
		ZipFile zipfile = new ZipFile(zip);
		BufferedOutputStream ds = null;
		BufferedInputStream is = null;
		ZipEntry entry = null;
		Enumeration entries = zipfile.entries();
		System.out.println("Start...");
		while (entries.hasMoreElements()) {
			try {
				entry = (ZipEntry) entries.nextElement();
				System.out.println((++fileCount)+") Extracting: " + entry);
				File tempFile = new File(unZipDir.getAbsolutePath() + "/"
						+ entry.getName());
				if(entry.isDirectory()){
					tempFile.mkdirs();
					continue;
				} else if (!tempFile.getParentFile().exists()) {
					tempFile.getParentFile().mkdirs();
				}
				
				is = new BufferedInputStream(zipfile.getInputStream(entry));
				int count;
				byte data[] = new byte[BUFFER];
				FileOutputStream fos = new FileOutputStream(unZipDir
						.getAbsolutePath()
						+ "/" + entry.getName());
				ds = new BufferedOutputStream(fos, BUFFER);
				while ((count = is.read(data, 0, BUFFER)) != -1) {
					ds.write(data, 0, count);
				}
				ds.flush();

			} catch (IOException ex) {
				throw ex;

			} finally {
				try {
					if (ds != null)
						ds.close();

					if (is != null)
						is.close();
				} catch (IOException e) {
					// ignore
	
				}
			}
		}
		System.out.println("Finished !");
	}

	public static void main(String[] args) {
		UnZip unZip = new UnZip();
		try {
			unZip.unzip(new File("C:/unzip/"), new File("C:/StockQuote1.war"));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}